Skip to main content
Log in

Nonspherical LED packaging lens for uniformity improvement

  • Regular Papers
  • Published:
Optical Review Aims and scope Submit manuscript

Abstract

Light emitting diode (LED) has more advantages compared with a traditional incandescent light bulb and a fluorescent lamp, such as small size, low quantity of heat, long life, low power consumption, fast response, plain packaging and ease of develop ment of a frivolous short product. A methodology is proposed to improve the uniformity of the LED illumination system. As a light source in a backlight unit (BLU), the requirement for optical characteristics of a LED is different from highly directional conventional ones. New diffused-type LEDs need to be developed to fulfill the requirement of the BLU industry. A non-spherical lens is designed to optimize uniformity, and a great improvement in uniformity from 28.4 to 64% is demonstrated. In the future, it may used in an LED display to improve the unevenness of illumination.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. W. A. Parkyn and D. G. Pelka: Proc. SPIE 4446 (2002) 232.

    Article  ADS  Google Scholar 

  2. S. J. Lee: Proc. SPIE 4278 (2001) 99.

    Article  ADS  Google Scholar 

  3. B. A. Jacobson and R. D. Gengelbach: Proc. SPIE 4446 (2002) 121.

    Article  ADS  Google Scholar 

  4. P. C.-P. Chao, L.-D. Liao, and C.-W. Chiu: Proc. SPIE 6196 (2006) 61960N.

    Article  Google Scholar 

  5. J.-G. Chang, L.-D. Liao, and C.-C. Hwang: Proc SPIE 6289 (2006) 62890X.

    Article  Google Scholar 

  6. Kenly Precision Industrial Co., Ltd., and the type of base is KHP01-2A.

Download references

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Yu-Cheng Chang.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Chang, YC., Ou, CJ., Tsai, YS. et al. Nonspherical LED packaging lens for uniformity improvement. OPT REV 16, 323–325 (2009). https://doi.org/10.1007/s10043-009-0059-7

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s10043-009-0059-7

Keywords

Navigation